21311013201 has 4 divisors (see below), whose sum is σ = 28414684272. Its totient is φ = 14207342132.

The previous prime is 21311013137. The next prime is 21311013203. The reversal of 21311013201 is 10231011312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21311013201 - 2⁶ = 21311013137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21311013203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551835531 + ... + 3551835536.

It is an arithmetic number, because the mean of its divisors is an integer number (7103671068).

Almost surely, 2^21311013201 is an apocalyptic number.

It is an amenable number.

21311013201 is a deficient number, since it is larger than the sum of its proper divisors (7103671071).

21311013201 is an equidigital number, since it uses as much as digits as its factorization.

21311013201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7103671070.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21311013201 its reverse (10231011312), we get a palindrome (31542024513).

The spelling of 21311013201 in words is "twenty-one billion, three hundred eleven million, thirteen thousand, two hundred one".